content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2013, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * ------------------------------
   * AttributedStringUtilities.java
   * ------------------------------
   * (C)opyright 2005-2013, by Object Refinery Limited and Contributors.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * $Id: AttributedStringUtilities.java,v 1.2 2005/10/18 13:24:19 mungady Exp $
   *
   * Changes
   * -------
   * 29-Jul-2005 : Version 1(DG);
   * 16-Jun-2012 : Moved from JCommon to JFreeChart (DG);
   * 01-Aug-2013 : Added toString() method (DG);
   * 
   */
  
  package org.jfree.chart.util;
  
  import java.text.AttributedCharacterIterator;
  import java.text.AttributedString;
  import java.text.CharacterIterator;
  import java.util.Map;
  
  /**
   * Some utility methods for working with <code>AttributedString</code> objects.
   */
  public class AttributedStringUtilities {
  
      /**
       * Private constructor prevents object creation.
       */
      private AttributedStringUtilities() {
      }
  
      /**
       * Returns a string containing the underlying character data for the
       * supplied iterator.
       * 
       * @param aci  the iterator (<code>null</code> not permitted).
       * 
       * @return A string. 
       */
      public static String toString(AttributedCharacterIterator aci) {
          StringBuilder builder = new StringBuilder();
          int count = aci.getEndIndex() - aci.getBeginIndex();
          char c = aci.first();
          for (int i = 0; i < count; i++) {
              builder.append(c);
              c = aci.next();
          }
          return builder.toString();
      }
      
      /**
       * Tests two attributed strings for equality.
       * 
       * @param s1  string 1 (<code>null</code> permitted).
       * @param s2  string 2 (<code>null</code> permitted).
       * 
       * @return <code>true</code> if <code>s1</code> and <code>s2</code> are
       *         equal or both <code>null</code>, and <code>false</code> 
       *         otherwise.
       */
      public static boolean equal(AttributedString s1, AttributedString s2) {
          if (s1 == null) {
              return (s2 == null);
          }
          if (s2 == null) {
              return false;
          }
          AttributedCharacterIterator it1 = s1.getIterator();
          AttributedCharacterIterator it2 = s2.getIterator();
          char c1 = it1.first();
          char c2 = it2.first();
          int start = 0;
          while (c1 != CharacterIterator.DONE) {
              int limit1 = it1.getRunLimit();
              int limit2 = it2.getRunLimit();
              if (limit1 != limit2) {
                  return false;
              }
              // if maps aren't equivalent, return false
              Map<AttributedCharacterIterator.Attribute, Object> m1 = it1.getAttributes();
              Map<AttributedCharacterIterator.Attribute, Object> m2 = it2.getAttributes();
              if (!m1.equals(m2)) {
                  return false;
              }
              // now check characters in the run are the same
              for (int i = start; i < limit1; i++) {
                  if (c1 != c2) {
                      return false;
                  }
                  c1 = it1.next();
                  c2 = it2.next();
              }
              start = limit1;
          }
          return c2 == CharacterIterator.DONE;
      }
      
  }
  